linux-kernel - Re: [PATCH 2/2] usb: dwc: host: add xhci_plat_priv quirk XHCI_SKIP_PHY

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Date:   Wed, 16 Feb 2022 15:16:40 +0800
From:   Jun Li <lijun.kernel@...il.com>
To:     Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Cc:     Peter Chen <peter.chen@...nel.org>,
        Pawel Laszczak <pawell@...ence.com>,
        Roger Quadros <rogerq@...nel.org>,
        Aswath Govindraju <a-govindraju@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        linux-arm-msm@...r.kernel.org,
        Linux USB List <linux-usb@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>, quic_pkondeti@...cinc.com,
        quic_ppratap@...cinc.com
Subject: Re: [PATCH 2/2] usb: dwc: host: add xhci_plat_priv quirk XHCI_SKIP_PHY_INIT

Sandeep Maheswaram <quic_c_sanm@...cinc.com> 于2022年2月16日周三 14:58写道：
>
> dwc3 manages PHY by own DRD driver, so skip the management by
> HCD core.
> During runtime suspend phy was not getting suspend because
> runtime_usage value is 2.
>
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> ---
>  drivers/usb/dwc3/host.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index eda8719..4a035a8 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -13,6 +13,14 @@
>  #include <linux/platform_device.h>
>
>  #include "core.h"
> +#include <linux/usb/hcd.h>
> +#include <linux/usb/xhci-plat.h>
> +#include <linux/usb/xhci-quirks.h>
> +
> +
> +static const struct xhci_plat_priv xhci_plat_dwc3_xhci = {
> +       .quirks = XHCI_SKIP_PHY_INIT,
> +};

It's better to create this xhci_plat_priv by each dwc3 glue layer,
with that, we can use this priv to pass other flags and possibly
override APIs by each glue driver which may not apply to all dwc3
platforms.

thanks
Li Jun
>
>  static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc,
>                                         int irq, char *name)
> @@ -122,6 +130,13 @@ int dwc3_host_init(struct dwc3 *dwc)
>                 }
>         }
>
> +       ret = platform_device_add_data(xhci, &xhci_plat_dwc3_xhci,
> +                       sizeof(struct xhci_plat_priv));
> +       if (ret) {
> +               dev_err(dwc->dev, "failed to add data to xHCI\n");
> +               goto err;
> +       }
> +
>         ret = platform_device_add(xhci);
>         if (ret) {
>                 dev_err(dwc->dev, "failed to register xHCI device\n");
> --
> 2.7.4
>